Column-lathe.



No. 743,728. PATBNTED NOV. 10,1903;

w. 0. KIRK.

COLUMN LAT-HE;

APPLIGATIOH IILED DEG 15, 190

NO MODEL. 8 SHEETS-SHEET 1.

H W inimumHI WITNESSES I lNVNT OR r WX W i ye Q W A llorneys m: NORRIS PETERS co. FNOT'J-UTHQ, vusumsmrq, a a

PATBNTED Nov. '10, 1903.

0. KIRK. 00mm LATHE.

APPLICATION FILED DEC. 15, 1902.

3 SHEETSSHEET a.

11v VENTOR N0 MODEL WITNESSES V Allomey;

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:ito. 743,725

UN TED STATES Ilatented November), 1903.

PATENT OFFICE.

WILLIAM CLARK KIRK, OF OHATTANOOGA, TENNESSEE.

COLUMN-LATHE.

PECIFIGATION formingpart of Letters Patent No, 743,728, dated November 10, 1 903.

Application filed December 16, 1902. Serial No. 135,306. (No model.)

a citizen of the United States of America, and

a resident ofChattanooga, county of Hamilton, State of Tennessee, have invented cer- ,tain new and useful Improvements in Column- Lathes, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is aside elevation of one half of a lathe constructed according to my invention,

the other half being a duplicate of that shown and being omitted for better illustration;

Fig. 2, an end elevation of the lathe, the bedbeams being shown in section; Fig. 3, an elevation of the rear end of the head-stock, a portion of the housing being broken away;

Fig. 4, a vertical longitudinal sectional view of a portion of the head-stock, showing the devices for adjusting the shaft of the headstock longitudinally to regulate the depth of out; Fig. 5, a face view of the tool-carrying plate or bar; Fig. 6, a transverse section thereof on the line 6 6; :Fig. 7, a vertical sectional view of one of the tool-holders, taken on the line 7 7 of-Fig. 8; Fig. 8, a face View of one of the tool-holders; Fig. 9, a detail view showing the adjustable arm carrying the removable feed-pin.

This invention has reference to that class of lathes especially adapted for turning or planing off the .end faces of columns, pipes, column-bases, I-beams, and like heavy articles and which consists generally of a suit able bed-frame, a pair of head-stocks slidably mounted thereon. and carrying the facing tools, means for driving the shafts of the head-stocks, and two or more work support-s or clamps adj ustably supported intermediate the head-stocks and adapted to rigidly and accurately support the work while the opposite ends thereof are being turned off; and the object of the invention is to simplify and improve the structure in various respects, as more fully hereinafter set forth. 7

Referring to the drawings, the letter a designates the I-beams, which, together with the transverse connecting-brackets 15, form the bed of the apparatus. Upon this bed are mounted two head-stocks, only one of which supported upon the I-beams.

along the bed Without undue friction.

is shown in the drawings. This head-stock consists of a frame 0, extending across and To clamp this head-stock at the desired point on the bed, bolts cl are mounted in lateral lugs formed integral with the frame of the head-stock and projecting out beyond the edges of the I- beams. The lower end of each of these bolts is bent inward, so as to engage under the outer flange of the I-beams, and upon the upper end of the bolt is screwed a fasteningnute. Four rollers f are employed, each being journaled to an eccentric g on the inner end of a short horizontal shaft 9, journaled in the frame, the outer end of. this shaft being provided with a handle it. By turning up these handles the rollers will be caused to impinge against the I-beams, and the headstock will be slightly raised from the beams, in which position it may be readily moved One of the clamping-bolts d is mounted at each corner of the head-stock, as shown, and one of the rollers is mounted adjacent to each clamping-bolt.

1 Journaled in suitable hearings in the frame '0 is the horizontal shaft 1 on the forward end the way to and from the center, a pair of radial screws Z are employed, as usual, the ends of these screws projecting beyond the ends of the bar j and carrying the usual star-wheel Each tool-chuck is provided with a pair of square sockets n for the reception of thetools, and, as shown in dotted lines in Fig. 5, these sockets are so placed in each block that the sockets of one chuck are at opposite sides of the central line of the chuck-bar and shaft from the sockets of the other chuck, the inner walls of these sockets being directly in line with each other and with the center of the shaft of the head-stock. To bring the tool sockets in this position with respect to each other, they are arranged at one side of a line drawn through the center of the chuck, as

shown in Fig. 8, the dotted line 0 indicating the central line of the chuck. The object in thus disposing the tool-sockets is to bring the cutting edges of the tools in line with each other and in line with the center of the headstock, whereby the cutting edges of the tools will travel to the center, and thereby avoid leaving a projection of metal at the center of the work being operated upon. To automatically adjust the tool-chucks along the chuckbar as the head-stock rotates, a pin 19 is supported in a bracket q, adjustably attached to one of the I-beams, this bracket being so positioned that the pin 19 will lie in the path of the star-whe e1 m, so that as each star-wheel passes the pin it will be slightly rotated, and thereby through the medium of the screw adjust the tool-chuck. In order that the feed may be stopped readily, the pin 1) is made removable from its socket on the bracket, whereby the feed may be stopped without adjusting the bracket out of the path of the star-wheels. The other end of shaft 2' passes through the sleeve-like hub r of a worm-gear s and carries at its extreme end a threaded axial extension I said sleeve-like .hub 1' being journaled in one of the standards of the frame 0 and being held against endwise movement therein by means of suitable nuts u, threaded on the end of said sleeve-like hub. A key 5- is dovetailed into the hub of gear 8 and adapted to work in a keyway in shaft 1', whereby the shaft may be shifted endwise independently of the gear, but will be compelled to rotate with it. Bolted to the outer face of the worm-gear is a shell or casing v, through a central opening in which the screw extension 25 passes. Threaded on the extension '15 is a nut w, which is provided with a hand-wheel for readily turning it and which has its inner end extended into the central opening in the shell 1) and provided with a flange 00 to engage the edge of said opening on the inner side of the shell. By this arrangement the shaft 1' may be adjusted endwise in its bearings independent of the wormgear in order that the tools may be adjusted up to and away from the work without loosenin g the set-screws holding them in their sockets. To adjust the shaft, it is simply necessary to revolve not w by means of its handwheel, as is obvious, and to lock the nut 10 in its adjusted position the wheel-binding nut y is screwed on the projecting end of the screw 6 and caused to jam against said nut w. To rotate the worm-gear and through it the toolshaft, I employ a worm z, carried by a shaft a and journaled in suitable hearings on the frame 0, and this shaft a carries a drivingpulley b on its projecting end. The wormgear and worm are desirably inclosed, as shown, in suitable housings.

At each end of the bed is arranged a suitable belt-tightener whereby the proper tension to the belt may be given irrespective of the position of the head-stock on the bed.

One of these belt-tighteners is shown in Figs. 1 and 2. This device consists, essentially, of an arm 0, attached at its lower end to ahorizontal shaft (1', j ournaled in suitable bearings at the end of the bed and carrying at its upper end apair of idle pulleys e, journaled on suitable stub-shafts carried on the respective ends of a bar f, which is pivoted midway its length in the upper end of arm 0. Attached to shaft (1 is a segmental worm-gear g, and journaled in suitable bearings adjacent to this segment and engaging therewith is a worm h. By means of this worm and wormgear the arm c may be adjusted vertically and be locked in any of its positions. The pulleys c are supported in alinement with the pulley b on the shaft a and also in alinement with the driving-pulleys t". The driving-belt has its lower part passed over the lower one of the pulleys e and its upper part over the upper pulley,as shown in dotted lines in Fig. 1, these pulleys serving to prevent the oppositely-traveling parts of the belt from impinging against each other and at the same time keep the proper tension on the belt. By pivotally supporting the bar f, carrying the pulleys 6, these pulleys automatically adjust themselves as the arm 0 is raised or lowered to accommodate the varying distances of the head-stock from the end of the bed.

Having thus fully described my'invention, what I claim, and desire to secure by Letters Patent, is

1. Ina lathe, the combination of a bed, a head-stock thereon, an endwise-movable shaft journaled 011 the head-stock frame, this shaft carrying at one end the tool-holders and having its other end provided with a threaded axial extension, a worm-gear secured to said shaft and j ournaled in the frame of the headstock and held against endwise movement therein, means for turning said worm-gear, a shell or casing attached to the worm-gear and having a central opening through which the threaded extension of the shaft projects, a nut engaging said casing or shell and threaded on said threaded extension,and abinding-nut, whereby the shaft of the headstock may be endwisely adjusted, for the purpose set forth.

2. In combination, a bed, a head stock frame, an endwisely-movable shaft j ournaled therein and carrying at one end the tool-holders, a gear journaled in the head-stock frame and having a hollow hub through which the other end of said shaft slidably extends, means for causing the gear to rotate with the shaft, means for securing the gear against endwise movement in its bearing, athreaded extension carried by said shaft, a nut on said extension and means for rotatably supporting said nut on the gear, means for turning said gear.

3. In combination, a bed, a head-stock, a gear journaled thereon and held against endwise movement therein, said gear having an opening in its hub, the tool-shaft journaled signature, in the'presence of two Witnesses, in the head-stock frame and having one end this 12th day of December, 1902. slidabiy working in the hub of the gear, means for endwise adjusting said shaft said WILLIAM CLARK KIRK 5 means being supported from the gear, and Witnesses:

means for operating said gear. H. H. STRATTIN,

In testimony whereof I hereunto affix my FRANCIS MARTIN. 

